Leakproof filtering apparatus



March 17, 1931. w. w. NUGENT LEAKPROOF FILTERING APPARATUS 1925 4 Sheets-Sheet l FiledV Sept. 11

dfn/.5.

March 17, 1931. w. w. NUGENT LEAKPROOF FILTERING APPARATUS Filed Sepia. "ll, 1925 4 Sheets-Sheet 2 s Q @hw March 17, 1931. w, W, NUGEN-r LEAKPRooF FILTERING APPARATUS Filed Sept. ll, 1925 4 Sheets-Sheet 3 March 17, 1931. w. w. NUGENT LEAKPROOF FILTERING APPARATUS Filed Sept. 1l, 1925 4 Sheets-Sheet 4 INA/EN Tw? Patented Mu. 17, 1931 UNITED STATES PATENT ori-ICE wnmnrr w. miem, or onrcaeo, rumors I mxrnoor surname Primeros appunti mea suffe-mbe: 11, 1m. sum n. sans.

-This invention relates to iiltering apparatus adapted to remove impurities from a lubricant, particularly lubricating oil, and one of its objects is to provide a ca k-proof 6 apparatus that may be used on tralns and boats where such apparatus is sub1ect to shock and vibration.`

Another objectof my invention is the provision of sealing means for closing the Vopening of a'ltermg receptacle.

Another object of my invention is to pro,-

vide a filtering device comprisin a plural-v` ity of filter members, any one o the same being adapted to be removed and cleanedwithout impairing the operation of the remainin members.

A furt er object of my invention is the` frame-work provision of an alarm to give a warning when the filtering device is not o rating roperly and thus to prevent waste ul overow of'oil.l

A further object of my invention is the provision of filter elements having improved ba retaining means. ther objects will ap ear hereinafter, the

novel features and com ination being more clearly set forth in the appended claims.

In the'drawin s: Fig. 1 is an en view of the filtering apparatus;

Fig. 2 is a transverse sectional view taken on a plane parallel to the end shown in Fig. 1;

Fig. 3 is a lon 'tudinal Asectional elevation taken on the 11ne 3-3 of Fig. 2 looking in the direction of the arrows;

Fig.4 is a plan view taken on the horil zontal plane of the line 4-4 of Fig. 2;

Fig. 5 is an elevational end view of Fig. 4; Fig. 6 is a plan view taken in the horizontal plane of the line 6-6 of Fig. 2;

Fig. 7 is an elevational side view of Fig. 6;

Fig. 8 is a top plan view of the filtering apparatus showing portions thereof removed to disclose vunderlying parts;

' Fig. 9 is a vsectional view of alarm mecha nism with which the filtering apparatus is equipped; and

Fig. 10 is a perspective view of one of the getaclable filtering bags shown in section inl eferring more particularly to Figs. 1 and 3 of the drawings it willbe seen that the ltering apparatus comprises a receptacle or tank 1 avin a flange 3 secured to the sides and ends o the upper portion thereof. This flange is angular in cross-section and is secured rigi y and permanently to the upper portion of the walls of the tank 1, preferably v,by means of solder. A top 1an view of the vframe-work 3 is disclosed) Vin Fig. 6 wherein bosses 4 are shown to be inte al with the frame-work and disposed beldw the horizontal portion of the angular -ilan e 3.

T e horizontal portion of the flange projects outwardly away from the walls of the tank 1 and is rovided with a smooth machined upper surfgce. The end 10 of the rectangular 'frame at the ri ht hand side of Fig. 6 is widerthan the ot er three sides and is provided with orts 7 with which pipes 8 communicate. dirt oil inlet pipe 9 is disposed below the wide flange 75 10 and communicates with each of the pipes 8. Both ends of the dirty oil inlet pipe are screw threaded, one end bein closed by a plug 84 which may be removed for the purpose of cleaning the pipe 9 by inserting a 80 rod or stick therethrough. The other screw threaded end is adapted to receive the end of a dirty oil supply pi e 86.

The tank or receptac e is provided with a cover comprising'a rectangular metal plate 85 11. This metal plate is secured to a rectangular frame 12, shown in Fig. 4, by means of a pluralit of flat head bolts 13 shown in Fig. 2. lhe bottom end of the opening 13 in the plate 11, through which 90 the bolts 13 pass, is counter-sunk to an extent sufficient to accommodate the head of the bolt and to retain the head of the same in a position with its flat surface iush with the ower surface of the frame. The upper ends of the bolts 13 pass through openings in the frame l2 and are provided with nuts 14 which hold the plate 11 and the frame 12 together.

VThe upper frame 12 also comprises 10c angular material as shown in section at 15 of Fig. 2. This frame is rovided with bosses 16 which register wit the bosses 4 of the lower frame 3. In Fig. 2 it will be seen that the bosses 4 of the lower framework 3 are drilled, tapped and provided with screw threaded stud bolts 17. These stud bolts 17 extend through openings 18 in the bosses 16 of the upper frame 12 and are provided at their upper ends with thumb or wing nuts 19.

It should be understood that the cover plate 11 and the bosses 16 of the upper frame 12 are provided] with openings which register with the stud bolts 17 and also that the cover plate 11 and the frame 12 are rigidly secured together by bolts 13 and nuts 14 distributed around the frame-work as indicated in Figs. 4, 6 and 8. I

The adjacent surfaces of the upper frame 12 and lower frame 3 are each machined smooth to effect a tight fitting relationship between the tank and the cover therefor. A rectangular sheet 20 of cork, asbestos, cotton or other fibrous, pliable material, is disposed, over the open end of the tank 1 and between the cover and the flange frame-work 3 to rovidc a packing so that when the thumb olts 14 are screwed down tightly on the stud bolts 17 against the upper surface of the bosses 16 a leak-proof joint is effected. This cork acking material may be in the form of a t in sheet of the same dimensions as the metal plate cover 11 or it may be in the forni of a gasket. The continuous rectan ular form is preferred for reasons hereina ter set forth.

A plurality of filtering bags 21 are provided within the tank or receptacle l. The

lter bags 21 are shown in Figs. 2. 3 and 10 suspended from elongated open frames 22 and to be restrained from bulging by a plurality of U-shaped metal loops on slings 23 securedat their upper ends to the frame 22 by means ofv nuts 24, 25, one above a projection 26 ofthe frame 22 and the other below said projection, both nuts engaging the same.

Extending around 4the frame 22 is an endless groove 27 to form key ways on the lateral sides of said frame 22. The key 2 8 shown in Fig. 10 is adapted to be grasped by the handle 29 and forced between the side of the cloth bag 21 and the vertical rods 23 after the bag is pulled up so as to cover the groove 27 and consequently the opening in the frame 22. It will be seen by referring to Figs. 2 and 3 that the U-shaped members 23 rest upon the bottom 30 of the tank 1 and that the ends 31 and 32 of the framev4 are placed at opposite ends of the tank. The end 31 of the frame 22 is provided with an extension 38 which abuts against a wear plate 33. This wear plate acts as a filler or wedge to force the other end 32 of the frame 22 against its side of the tank and aids in incasis the filtering element in a fixed position t at will not be easily altered by shock or vibration. The wear plate may be removed and replaced by a new one after its thickness becomes reduced by the sliding engagement between"` it and the-extension 38 when the filter elements are being removed for cleaning and while they are being resupportingl 'stored to their proper positions in the tank.

are preferably provided on the frames 22 to` enable such frames to be lifted from the tank l. An attendant may grip one pair of flanges with the first finger and thumb of one hand and the other pair of flangeswith the first finger and thumb of the nther.

hand and conveniently lift the frame and the filter bag attached thereto from the tank. The bags may thus be removed many times without removing them from the frames before they are worn out, after which a new bag may replace a worn out one by pulling the same from the position shown in Fig. 10 to a position enclosing the lower portion of the frame 22. A wire or string may then be tied around the open edge of the bag 22 in a position adapted to force a portion of the bag near its upper end into the groove 27. Two keys of the type shown in Fig. 10 may then be inserted so as to engage the exterior sides of thecloth comprising the upper edge of the bag, one key being inserted on each side of the frame 22. The keys are adapted to engage the U-shaped members 23 and are thus maintained tightly in contact with the clothv comprising the bag.

The frame 22 is elongated and comprises two longitudinal sides 34, 34 and two rounded ends 35, 35 and is provided with an elongated opening 36 extending longitudinally from one end of the tank to the opposite end as shown in Fig. 8. Thus, it will be seen that lubricant may be introduced into the various bags 22 through the openings 36 in the frames 23. One end of each frame 22 is provided with a trough 37 which registers with a port 7 in the tank wall 39 and with the inlet pipe 8. These inlet pipes, asy explained, lreceive the dirty oil from the supply pipe 9 and distribute the saine lto each of the filter bags 21. The extension or bracket 38 and the receiving end 32 of the frameV 22 fit tight between the end walls of the tank to hold the filter bag 21 depending therefrom apart from thewalls of the tank, 1', the wedge l one longitudinal side abutting f of the next adJacent frame.

or wear plate 33 assures that the end 32,

of the frame 22 having the tro h 37 therein will be firmly against t e end 39 of the tang) to hold the trough 37 in registration with -the port 7 and the pige. 8.

It will be seen by refe to 1g. 8that the longitudinal s1des'34, of the frame 22 have s ilanges extending outwardly laterally therefrom, the iiapges of nst the tu nal side ese flanges are adapted to hold the frames 22 spacedapart so that they will remain in proper positions in relation to the ports 7 and so that the b will be kept apart.

An overow ipe 41 isA connected by means of screw t reads 42 with the supply pipe 9. This overflow pipe communicates with an alarm mechanism shown Fig. 9.

respective il of the lon vThe overflow alarm mechanism comprises a chamber 44 wherein a pivotally mounted pan 45 havin a counter-balancin arm 46 is positione to receive the oil disc ar ed from the pipe 41. The pan 45 is locate directly .below an opening 47 in the pipe 41. Thus it will be seen that some of the liquid which overflows lthrough the pipe 41 is delivered to the pan 45, the remainder being free to ilow into the compartment 44 and thence to the ipe 60 back into the tank 1 as shown in 1g 3. Y

The additional weight of the liquid in the pan 45 causes the same to be tilted down on its pivot 48 and also causes the counterbalancing arm 46 to be tilted upwardly to engage an insulated electric contact., 49.

The contact 49 is mounted on and extends iow pipe 41 the arm 46 attached to said ses'4 pan closes an electric switch completi an electric circuit from the terminal 54 o the dry cell 55 through the bell 53, switch contacts 49, 46 and through the metal casing 56 to the outer terminal 57 of the dry cell.

A restricted opening or hole 58 is provided in the bottom of the pan 45 to slowly drain the oil from the same. Therefore when the necessary adjustments have been made in the filtering apparatus the supply of oil to the pan 45 will be discontinued and the oil in this an willbe slowly drained through the ho e 58. The pan will then again resume its normal position automatically and the bell 53 will discontinue to ring.

When the oil leaves the pan 45 it is free i to pass' from the chamber 44 to a large pipe 60 which communicates with the interior of the tank 1 through the rt 61 in the end wall thereof as shown in ig. 3. It willthus be seen that the fluid actuating mechanism for the automatic t1verllow alarmdis in a bypacompnsingU e i 41an 60.

.When all of the elements are operating E rly the dirty or used lubricant enters t e tering ap aratus through the iplipe 9 and is dischar into the removable lter bags 22 throu the inlet pipes 8 and ports 7, there being-one inlet pipe for each lter bag. The oil filters throu h the cloth compri the bags 22 and col ects around the same 1n the tank 1. A clean oil outlet opening 62 is provided with a threaded member 63 for attaching a pipe to the tank, not shown inthe drawing, for conveying the filtered lubricant.

This outlet4 opening 62 is positioned suciently above the bottom of the tank to allow a thinlayer of liquid to remain in the tank. Thus the lower-most layer of'liquid remains in the tank and collects the small particles of solid material and impurities to orm a sediment. The filtered oil that is conveyed to machinery for further use is drained from the tank at a int above this layer. A drain opening' 64 1s provided near the bottom of the tank land below the outlet opening 62 for periodicall removing the layer of impurities and soli particles that collect as sediment at the bottom of the tank. This drain opening 64 may be closed by a screw cap or it may be provided with a threaded member 65 `as shown in Fig. 1. A pipe not shown in the drawings may be secured by means of the threaded member 65 to the tank 1 for carrying the contaminated liquid away.

A union 69 is preferably disposed in the by-pass comprising the pipes 41 and 60 to ermit detachment of the alarm mechanism or cleanin purposes. This union may be uncou led y unserewing the nut member 67. he nut member 67 may be unscrewed and moved in the direction of the tank and away from the geirrt. The entire alarm mechanism, inclu ing the pipe 60 that is attached to the bottom thereof, may then be rotated and unscrewed from the overflow pipe 41 thus completely detaching the alarm mechanism from the tank 1.

The lower part of the alarm mechanism may be detached from the tank 1 leaving the upper (portion including the battery 55, an 45, an switch contacts 46 and 49 in t eir proper positions. This detachment may be eifected by removing the screw-head bolts 68 from the walls of the chamber 44. When the union 69 has been uncoupled and the four 'bolts' 68 removed the box 70 which encloses the chamber 44 may be lowered and separated lfrom its'upper cover 50 thus leaving lower valves 74 and 75 respectively, each vbeing provided withclamping means comprising a nut 76 for'lioiding the ends of a transarent tubular member 77 in place. As the ii uid rises in the tank 1 it also rises in the tu ular member 77 thus disclosingthe level of the liquid.

The closure for the open end of the tank 1 preferably comprises the rectangular open framework 3 of angular section and the thin cover plate 11. This construction affords a light and effective closure having satisf`actory clamping facilities Aand sufficient strength to withstand the pressure exerted by the clamping members. Lifting loops or handles 78 and 79 are -secured to the uppermost surface of the cover plate 11 by brackets 80 and 81, respectively. These lifting loops extend suiiiciently above the plate 11 so that one may be grlpped with one hand and the other with the other hand for lifting the closure from the tank after the thumb nuts have been removed. This light closure may be conveniently removed and replaced by the handles 78 and 79 without the aid of tools of any form. The framework 3 of angular section adds sufficient stiffness and strength to the closure to prevent bending of the thin plate member 11 and also distributes the pressure exerted by the thumb-screws along the entire edge of the plate.

It should be understood that the filtering apparatus is designed to be light and compact for the purpose of adapting it for installation on boats and trains where space is limited. The filtering bags 21 are supported by the frames 22 and the wire loops 23, which are securely held in place within 'the tank 1. The bracket 88 on one end of each frame 22 engages the wear plate 33 and forces the other end of the frame against its adjacent end of the tank 1, with the trough v37 of the frame in registration with the port 7. The position of the elements ofthe filtering apparatus is thus retained in a fixed relation even though the boat or train upon which it is installed is subjected to severe shock and vibration.

The tightly fitting closure presses downwardly upon the top of the filter frames 22 holding the cork platev2() -firmly over the longitudinal openings 36 in such frames thereby closing the longitudinal openings to prevent the dirty liquid from being mixed withthe filtered liquid. This downward pressure is resisted by the U-shaped support- .leak-proof joint that is .particular to prevent spilling of the, liquid.

sure 011 the topof the ,filter frames whichare in turn supported" by the U-shaped members 23 which rest upon the bottom 30 of the tank.. This closure also rovides a y adapted Brackets 82 are secured-to the end walls of the tank adjacent ,the bottom corners thereof for securing the tankl to the Hoor of a boat or train. Holes 83 are referably provided in the brackets to receive an anchoring screw or bolt. These brackets hold the entire apparatus in a fixed. osition and prevent any movement thereof ue to swinging and jerking in a locomotive -or boat installation.

Obviously those skilled in the art maymake various changes in the details and arrangement of parts without departing from the spirit and scope of the invention defined by the claims hereto appended and I wish therefore not 'to be restricted to the precise construction disclosed.

. Having thus fully described and shown an embodiment of my invention what is desired to be secured by Letters Patent of the United States is: Y

1. In filtering a paratus, the combination with a tank, of a lter element in said tank,

means for supplying liquid to said filter element, a by-pass from the filter element to the tank, and overflow indicating mechanism mounted in said by-pass.

2. In filtering apparatus, the combination with a tank, of a plurality of lter elements, a manifold having liquid tight connection with said filter elements for supplying liquid in multiple to said filter elements, and

a by-pass connected between said manifold and the tank adapted to by-pass the Huid being filtered when the flow through said lter elements is restricted.

3. In filtering apparatus, the combination with a tank, of a plurality of filter elements therein each having a frame with an opening in its top, a filter bag secured to said frame and communicating with said opening and a cover adapted to effect a liquidtight closure for the tank and also for each of said frames to prevent leakage from the filter elements into the space surrounding the saine when the tank is subjected to shock or vibration.

4. In filtering apparatus, the combination with a tank, of a plurality of individual removable filter elements therein each comprising a frame having openings therein, ai cover adapted to close the tank and also one side of said opening, means for securing said cover detachably to said tank to rmit removal of said iilter elements indivi uall means for mounting said iilter elements 1n said tank in position to ermit said cover to close said open to rames when said tank is closed, and fi ter bags having the mouths thereof communicating with said openings to close said openings on the opposite sides thereof.

5. In filtering ap aratus, the combination with a tank, of a p urality of filter elements each comprising a frame with its upper side open and a filter bag connected to lts lower side, means for mounting said filter elements in said tank with said open sides of said frames on top, and a horizontal cover fitting said tank to afford a liquid-tight seal for the filtering apparatus.

6. In filtering apparatus, the combination with a tank, having an open upper end, of a plurality of individually removable filter elements comprising filter bags with their upper ends open, means directilg liquid to be filtered into open ends of sai bags, and a closure for the tank com rising liquidtight packing disposed over t e upper open ends of said bags to close the u per ends thereof and seal the open ends of) the bags from the space within the tank around the bags to prevent spilling of the liquid from the tops of the filter elements into such space.

7. In filtering apparatus, the combination with a tank, having an open top, of a frame secured to the upper edge ortion of said tank, a lurality of filter e ements in said tank eac comprising a filter ba with an open top, a packing of sheet cor disposed over the open top of said tank and over the open tops-of said bags for individually sealing each of the latter as well as said tank, a metal plate coverin said cork, and means for clamping said p ate and cork against said frame and against the tops of said filter elements.

8. In ltering apparatus, the combination with a tank, of a plurality of iilter elements mounted in spaced relation in said tank and each having an elongated frame with its ends at the opposite end walls of the tank inside of the latter and below the upper edge thereof, and a cover for the tank and said filter elements.

9. In iiltering apparatus, the combination with a tank, of a plurality of filter ele-`r ments each comprising an elongated frame with its ends engaging the opposite end walls of said tank inside of the same and below the top thereof, and lateral projections on said frames in labutting relation with each other and with the walls of the tank inside of the same to maintain the filter elements in predetermined spaced relation.

10. In filtering apparatus,.the combination with a tank, of a plurality of filter elements each comprising a framev with a filter ba connected thereto, projections on the en s of said frames and on the outer sides of the side frames for enga 'n the inner walls of the tank to space t e ags therefrom, and abutting rejections between said frames for spacing t e bags from each other and holding said frames against lateral vibration in said tank.

11. In filtering a aratus, the combination with a tank, ofiriltering elements each comprising a removable frame in said tank, and abuttmg projections on said frames to keep the same spaced from each other while in said tank.

12. In filtering apparatus, the combination with a rectangular tank, of a plurality of elongated filter elements each comprising an elongated frame fitting in co-relation in said tank, and end projections for said frames for engaging opposite end walls of said tank to hold the frames against endwise movement.

13. In filtering apparatus, the combination with an elongated tank, of a plurality of removable filter elements each comprising an elongated frame with its ends engagin the opposite end walls of said tank, and lateral projections on said frame for engaging the side walls of the tank and for engaging lthe next adjacent frame to hold the frames while in the tank a ainst lateral movement relatively to the tank.

14. In filtering a paratus, the combination with a tank, o a plurality of filtering elements therein each comprising an elon gated frame with a filter :bag connected thereto, means for removably supporting said filter elements in said tank and two pairs of lateral projections on each elon gated frame in positions to be grasped at spaced apart points for lifting the same together with its filter bag from the tank.

15. In filtering apparatus, the combination with a tank, of a filter element comprising a frame and a filter bag suspended therefrom, and means engagin the bottom of the tank for holding said rame in the upper portion of the tank with the bag thus suspended.

16. In filtering apparatus, the combination with a tank of a filter unit com rising a frame with a filter bag connected t ereto, and means for supporting said frame on the bottom of the tank and against the opposite end walls thereof.

17. In filtering a paratus, the combination with a tank, o a removable iilter element therein comprising a frame with a filter bag connected thereto, a plurality of loops connected to said frame and extending downwardly therefrom along the sides and bottom of the bag to the bottom of the tank, and projections on the ends of. said los' frame to engage opposite walls of said tank. l

18. In filtering apparatus, the combination with a tank, of a plurality of elongated filter elements therein each engaging opposite end walls of the tank and occupying the space between the side walls thereof, a plurality of loops connected to each frame to support the same on the bottom of the tank and hold said frame at the upper portion of the tank, and a cover for the tank and adapted to engage'the tops of'said frames tonlliold said loops againstthe bottom of the ta 19. In filtering apparatus, the combination with a tank, of a plurality of filter elements therein each comprising an elongated yframe with an open top and a filter bag suspendedtherefrom, open framework at the sides of each bag to support the said frames from the bottom of the tank and hold the bags spaced from each other, means for preventing lateral and endwise movements of said frames relatively to said tank while in the latter, and a cover for the tank adapted to engage said framework against the bottom of the tank and cover the openings lin 'said frame.

20. In filtering mechanism, the combination with a tank having an open top, of a filterin unit comprising a filter bag and a frame or supporting said filter bag extendi'ng lengthwlse of said rectangular tank, means ada ted to engage the bottom and ends of sai tank for holding up said frame liquid conveying means at one end of said tank for deliverlng liquid to saidl filter bags,

and a cover for closing the open end of said v tank.

21. In filtering 'mechanism, the combination with a tank, of a filtering unit comprising a filter bag and a frame having a continuous groove located substantially at the bottom of the same, adapted to engage the cloth sides and ends of said bag near the upper edge of the same, of a key to rechne in said groove and to engage the cloth comprising the sides of said filter bag, and restraining guides secured to said frame to prevent bulging of said filter bag, said guides being vadapted to rest upon the bottom of said tank for supporting said filtering unit.

' 22. In filtering mechanism, the combination with a tank for receiving filtered liquid,

' of a filtering unit comprising a bag having an o en end and an open frame, the lower portlon of said frame being adapted to telescope the opening in said bag and to vbe secured to the material comprising the sides of the same, and restraining guides secured to the sides vof said frame to prevent bulging of said bag, said guides being rigid and adapted to rest upon the bottom cf said receptacle for supporting said filtering unit.

23.A In filtering apparatus, the combination with la tank, of a filterelement supported in said tank, means' afordin aliquid-tight covering for said filter cement,

and a byass from the filter element to the tank to a ord passage for-the liquid in the filter element when entering beyond the f capacity of the latter.

24. In filtering apparatus, the combination with a filter bag having an open end, a tank for enclosing said filter bag, a frame adapted tovrest on the bottom of said tank to form a suspension support for said lter bag, a cover for closing said tank to con-fine y liquid in said filter bag and in the spacel therearound, and means for securing a li uid-tight engagement between said tank an saidcover.

25. In filtering apparatus, the combina-- end of said frame to said filtering mechanism, and an overow connection between said directing means and said tank.

27. In filtering apparatus, the combination with a tank, of filtering ap aratus therein, means for preventing said ltering apparatus from overflowing i-nto the tank, and an overflow extendin from the filtering apparatus to an elevation above the top of the filtering apparatus.

28. In filtering apparatus, the combination with a tank, of filtering mechanism thereinA comprising an open topped frame with a filter bag suspended therefrom, a cover for closing the top of the tank and alsothe top of said frame, and an overflow connection extending from said open frame to an elevation above the same and thence into the tank, said overfiow being operative when the capacity of said filter is exceeded.

29. In filtering apparatus, the combination with a tank, of filtering apparatus comto an elevation above the latter and thence to the overfiow signal to operate the latter to indicate that the filtering apparatus requires attention.

30. In filtering apparatus, the combination with a tank, of filtering apparatus therein, an overflow connection from the filtering apparatus to an elevation above the latter, an overflow signal, a pipe leading to said tank :from said signal, and means to detachably connect said pipe to the tank and to said si a1. 1

In testlmony whereof I have si ed my name to this ication on this 851D day of September A. 1925.

WILLIAM W. NUGENT.

' soV 

